Bronze is an old world material that does not deteriorate in coastal or other regions. The Bronze finish, however, is a "living" finish. This means that it changes over time in a way that most people find desirable. When bronze is exposed to air it will tarnish quickly and turn brown. When bronze is exposed to exterior elements it will turn green. This condition is known as "patina". This is also considered desirable by most people. These conditions are not considered "defects" but are part of the natural beauty of bronze.